One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10,14,17)(11,15,19,24)(12,20,13,16)(18,23,21,22)(25,26,30,34)(27,31,36,39)(28,33,29,32)(35,40,37,38)(2,5)(6,8)(9,11,14,19)(10,15,17,24)(12,21,13,18)(16,23,20,22)(25,27,30,36)(26,31,34,39)(28,37,29,35)(32,40,33,38)(9,10)(11,15)(12,16)(13,20)(14,17)(18,22)(19,24)(21,23)(25,28,30,29)(26,32,34,33)(27,35,36,37)(31,38,39,40)(9,12,14,13)(10,16,17,20)(11,18,19,21)(15,22,24,23)(25,29,30,28)(26,33,34,32)(27,35,36,37)(31,38,39,40)(9,13,14,12)(10,16,17,20)(11,18,19,21)(15,23,24,22)(1,3,4,7)(2,6,5,8)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.